Put this THEORY to the test. The evolution of the bowling ball never has reached a level this advanced!The Theory we are bringing to you is based on an exciting new interior shape called the Triliptic Core.It's a triple elliptical shape that has a myriad of benefits from consistent axis migration to the ease of drilling and predictability of ball motion...it's all there! It takes lots of engineering to come up with a design this intense, and you can literally FEEL the blood, sweat and tears that have gone into the creation of this Theory.Roto Grip - It's all about the ATTITUDE!Product Type: Bowling Balls Type: Bowling Balls Size: 14 Pounds Color: Multi-Color Color Mapping: Multi-Color Coverstock: Reactive Resin Performance: Pro Performance Core Type: Asymmetric Finish: Sanded